Source Normalized Impact per Paper (SNIP):2017: 0.492SNIP measures contextual citation impact by weighting citations based on the total number of citations in a subject field.

Impact per Publication (IPP): 0.588

Impact per Publication (IPP):2016: 0.588The Impact per Publication measures the average number of citations received in a particular year by papers published in the journal during the three preceding years.

SCImago Journal Rank (SJR): 0.22

SCImago Journal Rank (SJR):2017: 0.22SJR is a prestige metric based on the idea that not all citations are the same. SJR uses a similar algorithm as the Google page rank; it provides a quantitative and a qualitative measure of the journal’s impact.

Cite Score: 0.49

Cite Score:2017: 0.49CiteScore metrics are a new standard to measure serial citation impact.

Muhtadi Muhtadi, Andi Suhendi, Erindyah Retno Wikantyasning

Abstract

Objective: The aim of this study is to determine the optimum formulation of gel nanoemulsion of the rambutan fruit peel extracts (RFPEs), sunscreen protecting factor, and antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric thiocyanate (FTC) methods.

Materials and Methods: Formulation was optimized based on the variety of concentrations of RFPE, namely, 0.25%; 0.38%; 0.51%; and 0.63%. Gel nanoemulsion was characterized based on a number of the physical and chemical properties, such as pH, viscosity, adhesion, spread property, stability, and particle size. Sunscreen protecting factor and antioxidant activity were conducted using spectrophotometer ultraviolet-visible.

Results: The result showed that the particle size of gel nanoemulsion formulation 1 (FI), FII, FIII, and FIV were at 13.30±4.00 nm, 1.90±9.70 nm, 2.70±13.60 nm, and 14.50±2.50 nm, respectively. Based on transmission electron microscopy image, it showed that formula with the concentration of 0.25% of RFPE could form nanoemulsion particle aggregate with good dispersion. The varied concentrations of RFPE statistically indicated no significant differences among adhesive, spread property, and viscosity of all formulas. Formula 1 showed the highest sunscreen protecting factor with the value of sun-protecting factor at 6.450±0.002, followed by F4, F3, and F2 with the values in sequence at 9.370±0.002, 10.120±0.001, and 13.120±0.001, respectively. The antiradical activity of the gel nanoemulsion RFPE with inhibitory concentration 50% (IC50) value was at 9.32±0.05 μg/ mL. Meanwhile, the higher value of branded product and Vitamin E, which IC50 were 40.41±0.97 and 10.41±0.05 μg/mL, respectively. In contrast, gel nanoemulsion of RFPE had the lowest inhibition on FTC method. The highest inhibition potency was showed by Vitamin E (79.07±7.62%), followed by branded product (60.07±13.23%) as comparison.

Conclusions: The gel nanoemulsion of RFPEs of FIII had a good physical stability and sunscreen protection activity. The antioxidant activity of gel nanoemulsion of RFPE by DPPH and FTC methods were IC50 value of 9.32±0.05 μg/mL and % inhibition of 51.09±0.99%.

Reynertson K. Phytochemical Analysis of Bioactive Constituents from Edible Myrtaceae Fruits. Dissertation Submitted to the Graduate Faculty in Biology in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy. The City University of New York; 2007.